Temperature compensating hydraulic door closer

Details Temperature compensating hydraulic door closer Temperature compensating hydraulic door closer

1977-11-30

1979-04-10

Feldbaum, Ronald

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Checks and closers

Liquid

16 84, E05F 304

Patent

active

041481119

ABSTRACT:
Hydraulic door closer apparatus comprises a cylinder, a piston disposed in the cylinder, linkage means coupled to the piston for transmitting forces between the piston and a door, and a hydraulic circuit for controlling movement of the piston in the cylinder. A temprature responsive control element is provided in the hydraulic circuit to alter the characteristics of the circuit in response to changes in ambient temperature or temperature of the fluid within the closer.

REFERENCES:
patent: 2021427 (1935-11-01), Peo
patent: 2192745 (1940-03-01), Hurd
patent: 2909248 (1959-10-01), Gies
patent: 2966170 (1960-12-01), Raulins
patent: 3340893 (1967-09-01), Lockwood
patent: 3574886 (1971-04-01), Solovieff
patent: 4019220 (1977-04-01), Lieberman

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